[w3c/uievents] Standardize layerX/layerY on MouseEvent (#135)

Being that layerX and layerY are available on all browsers for MouseEvent we should standardize it.

@samug---- perhaps FireFox should move it from UIEvent to MouseEvent solely?

Edge, IE, Chrome all have it only on MouseEvent

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Received on Thursday, 23 February 2017 18:24:58 UTC